1. affectedly grand or important; pompous: grandiose words.
  2. more complicated or elaborate than necessary; overblown: a grandiose scheme.
  3. grand in an imposing or impressive way.
  4. Psychiatry. having an exaggerated belief in one’s importance, sometimes reaching delusional proportions, and occurring as a common symptom of mental illnesses, as manic disorder.


  1. pretentiously grand or stately
  2. imposing in conception or execution

1828 (earlier as a French word in English), from French grandiose “impressive” (18c.), from Italian grandioso, from Latin grandis “big” (see grand (adj.)). Related: Grandiosely.

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